Orchestrating a β-Hydride Elimination Pathway in Palladium(II)-Catalyzed Arylation/Alkenylation of Cyclopropanols Using Organoboron Reagents

J Org Chem. 2022 Apr 1;87(7):4508-4523. doi: 10.1021/acs.joc.1c02735. Epub 2022 Mar 15.

Abstract

The scope of chemoselective β-hydride elimination in the context of arylation/alkenylation of homoenolates from cyclopropanol precursors using organoboronic reagents as transmetalation coupling partners was examined. The reaction optimization paradigm revealed a simple ligand-free Pd(II) catalytic system to be most efficient under open air conditions. The preparative scope, which was investigated with 48 examples, supported the applicability of this reaction to a wide range of substrates tolerating a variety of functional groups while delivering β-substituted enone and dienone derivatives in 62-95% yields.

MeSH terms

  • Catalysis
  • Ethers, Cyclic
  • Indicators and Reagents
  • Molecular Structure
  • Palladium*

Substances

  • Ethers, Cyclic
  • Indicators and Reagents
  • cyclopropanol
  • Palladium